Material I used, all of it was around my basement
A: Block hardwood 2" by 4" by 1" thick could be 3/4"
B: 3/4" Dowel Pin by 8 inches long
C: Short Wood Pencil
D: Drill 3/4 Hole 1-1/4" down on center, on the 2" by 4" block. It holds the dowel pin
E: On the dowel pin one inch from the end drill 19/64 hole. It will hold the pencil stub nice and tight
F: Optional You can drill a hole for a 1/4- 20 tap for a set screw on the side of the block, to snug the dowel pin
I used some masking tape on the dowel pin and it works just fine, nice and snug I used two layers of masking tape
I use it to find centers for my holes and to draw parallel line on my plugs